In portable hardness test of a 28 inch WP11 tee we had some problem. As standards mentioned, before testing we should remove all oxides ,paint,.....
We prepare surface with a grinder till we visually see bright mirror like surface. The result of hardness test was 215 brinnel. We checked the thickness. By our first preparation ,the thickness decreased 0.1mm. I suggested to grind 0.1mm more and the results became within the range of standard ,about 170 brinnel.
Are we allowed to do the above mentioned process according to astm standards.